Bronze powder and the process of making same



UNITED STATES MAX BAER, OF NEW YORK, N. Y. 1 c

BRONZE POWDER AND THE PROCESS OF MAKING SAME.

No Drawing.

To all whom it may concern: I

Be it known that I, MAE: BAER, a citizen of the United States, and resident of the borough of Manhattan, in the city, county, and State of New York, have invented certain new and useful Improvements in Bronze Powders and the Processes of Making Same, of which the following is a specification.

This invention relates to bronze powders and has for its object to provide a bronze powder which is bulkier and of larger body resulting in a correspondingly larger covering or spreading capacity than the bronze powders heretofore used. As a result of a larger spreading surface the cost of use is correspondingly decreased. At the same time, my improved powder, when used, and particularly when used in the printing art, gives a finer and more superior polish. My invention contemplates also the improved process for making the novel and improved powder referred to, and the bronze powder and the process for making it will be hereinafter fully described, and finally claimed in the claims appended hereto.

In the carrying out of my process, the fluid metal used for the bronze to be hammered, is cooled or chilled in the presence of water jets 'which strike against the bronze while it is in a fluid or molten state,-and by the cooling-or chilling resulting, the solidified bronze metal is porous and in the form of metal strips and pieces. The relative porosity of the precipitated bronze, when subjected to the hammer for breaking it up to powder form causes the metal to break up quicker and into thinner and lighter pieces, than when ordinary cast bronze metal is used. Such breaking up, and the formation of such pieces, produces a'bulkier and fiuffier and lighter powdered metal.

During the time, that the bronze metal precipitated as heretofore described in the presence of water is subjected to the hammering action of the hammers, it is treated with a high grade olive oil or similar oil, which keeps the metal, while being crushed and powdered, more evenly distributed and oiled, the liquidity of the oil giving a thin and light fat or oil covering, which quickly surrounds the particles as they become broken by the hammers. This oil covering serves to keep apart the particles in that the oil covering serves to keep separate the Specification of Letters Patent.

7 Patented July 27, 1920.

Application filed January 20, 1919. Serial No. 271,974.

adjacent particles and keep them from closely contacting.

' After the metal as described hasbeen hammered to the desired degree of fineness, to form bronze powder, the separate particles are what may, be called flufi'y, and. as a result of this the superimposed particles serve to make a relatively large quantity compared to bronze powders heretofore in use. This flufliness gives a large spreading surface to the powder when it is applied to practical use, as the separate particles not being as compactly held together as powders heretofore in use, a given quantity of my improved powder may be spread farther and thereby cover a larger area, than the same quantity of powder heretofore known to the art. Moreover, and this is important, such fiufiiness of the finished product, brings about a better and more brilliant polish than powders heretofore in use, when such improved powders are used in the printing arts. As an example, in the making of cigar bands in which bronze powders are used, and which are subjected to pressure, it has been found that the use of my improved powder due to its fluffy character or the separate particles being superimposed, only a stamping is required, and the additional polishing heretofore required is obviated since this single stamping of the fluffy powder at the same time polishes the powder on the cigar bands, so that a further or additional polishing is not necessary. This is believed to be due to the fiuify character of the particles, .Which create a certain resistance to the stamping, whereby a polishing results, whereas with a highly powdered powder, no such resistance is encountered, and thus an additional polish becomes necessary. At the same time, with the fluffy powder described, the fiuify or.flocculent form of the superimposed particles, spread to a greater extent, and form so to say several superimposed layers on the cigar band. The effect of this is that the lowermost layer, which becomes interposed between the paper and the uppermost layer of the powpowder, and thereby destroy the appear-- ance of the gilt stamping on the agar bands.

7 accordance with my invention, the strata that are formed by the flakes of metal serve to insure a long life to the quality and brilliancy of the applied metal powder.

In certain cases, it may be desirous of polishing the powder described, and in that case, my invention contemplates the foreing of the powdered metal against the sides of polishing drums with great speed or velocity, and without bristle or hair, brushes or the use of lard as heretofore proposed. In certain cases, we find it advantageous to use steel or metal wire brushes, in connection with this polishing. If polishing is carried out, it will be done totally different than heretofore, namely, without greasy, fatty, oily substances of any kind, and absolutely dry.

I have spoken of a bronze powder and it is clear that the same comprises all shades such as gold, lemon, orange, fire, green, copper and similar colored bronzes.

I have described my improved process in regard to its essential elements and also the new powder, but it is clear that changes may be made in the steps described without departing from the spirit of my invention as defined in the appended claims.

I claim as new and desire to secure by Letters Patent:

.in cooling fluid metal in the presence of water for rendering it porous and subjecting it to a continued hammering in the presence of a liquid fat or oil, until a fluffy or flocculent powder results. 5

2. The process herein set forth for the making of bronze powders, which consists in cooling fluid metal in the presence of water for rendering it porous, subjecting it to a continued hammering in the presence of a liquid fat or oil, until a fluify or flocculent powder results, and polishing the same without greasy, fatty, or oily substances of any kin In testimony that I claim the foregoing as my invention, I have signed my name hereunder.

MAX BAER. 

